XML 26 R32.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Note 6 - Employee Benefit Plans (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 29, 2014 | Mar. 29, 2014
Note 6 - Employee Benefit Plans (Details) [Line Items] |  |
Pension Contributions (in Dollars) | $ 52,000 | $ 101,000
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year (in Dollars) |  | $ 139,000
Supplemental Employee Retirement Plan, Defined Benefit [Member] |  |
Note 6 - Employee Benefit Plans (Details) [Line Items] |  |
Supplemental Retirement Benefit Period |  | 15 years
Defined Benefit Plan, Percent of Highest Average Salary Base |  | 50.00%
Defined Benefit Plan Number of Years in Average Annual Base Salary |  | 5 years
Defined Benefit Plan Number of Years Preceding Retirement for Average Annual Base Salary Calculation |  | 10 years
Reduced SERP [Member] |  |
Note 6 - Employee Benefit Plans (Details) [Line Items] |  |
Defined Benefit Plan, Retirement Age |  | 65 years
Minimum [Member] | Supplemental Employee Retirement Plan, Defined Benefit [Member] |  |
Note 6 - Employee Benefit Plans (Details) [Line Items] |  |
Defined Benefit Plan, Employment Term |  | 30 years
Minimum [Member] | Reduced SERP [Member] |  |
Note 6 - Employee Benefit Plans (Details) [Line Items] |  |
Defined Benefit Plan, Employment Term |  | 10 years

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanEmploymentTerm
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanNumberOfYearsInAverageAnnualBaseSalary
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanNumberOfYearsPrecedingRetirementForAverageAnnualBaseSalaryCalculation
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Percent of Highest Average Salary Base + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanPercentofHighestAverageSalaryBase
Namespace Prefix: | iiin_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | iiin_DefinedBenefitPlanRetirementAge
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | iiin_Note6EmployeeBenefitPlansDetailsLineItems
Namespace Prefix: | iiin_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | iiin_SupplementalRetirementBenefitPeriod
Namespace Prefix: | iiin_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash or cash equivalents contributed by the entity to fund its pension plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
Name: | us-gaap_PensionContributions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration